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too much
Well, considering that you don't turn on the water while you're brushing, and only turn it on to fill your cup, and rinse your toothbrush, I would say probably 1-2 gallons wasted. Of course, this is only an estimate, and I can't back this up with statistics and such, but I'm sure this is somewhere close to a definite answer. :)
The bathtub can waste close to 50 gallons of water per use. To save water, a shower is the better option and uses less water.
A 50mm (2 inch) shower waste trap.
Shower, Shower heads can usually allow anywhere between 2.5 and 5 gallons of water a minute. Toilets can use this volume in a single flush. As most showers last longer than one minute the shower volume is considerably higher.
we waste 10 gallons a day becaus of motor cars we waste 10 gallons a day becaus of motor cars
depending on opening and pressure possibly 2,000 GPM with no flow restrictors an open pipe, no shower head, will pump around 10 gallons per minute. a high volume shower head, about 8 gpm and highly restricted will dump less than 3 gallons per minute. try it yourself, use a garden hose and a 5 gallon bucket and shut the hose off at 30 seconds. double that for the quantity you would get at 60 seconds.
electrical energy forces the water out.
3000 gallons
Own waste line 2" (Shower) 11/2" waste tub and both need to be trapped and vented
about 2 gallons
55 gallons